/*
 * Copyright (C) 2008 ZXing authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package android.camera;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.graphics.PixelFormat;
import android.graphics.Point;
import android.graphics.Rect;
import android.hardware.Camera;
import android.os.Handler;
import android.util.Log;
import android.util.Utils;
import android.view.SurfaceHolder;
import android.hardware.Camera.Size;
import com.google.zxing.PlanarYUVLuminanceSource;
import com.iflytek.cloud.thirdparty.C;
import java.io.IOException;
import java.util.List;
import artid.com.arttogo.activity.CaptureActivity;

/**
 * This object wraps the Camera service object and expects to be the only one
 * talking to it. The implementation encapsulates the steps needed to take
 * preview-sized images, which are used for both preview and decoding. <br/>
 * <br/>
 * 
 * 该类封装了相机的所有服务并且是该app中唯一与相机打交道的类
 * 
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class CameraManager {

	private static final String TAG = CameraManager.class.getSimpleName();

	private static final int MIN_FRAME_WIDTH =0;

	private static final int MAX_FRAME_WIDTH =0; // = 5/8 * 1920

	private final Context context;
	private final Activity mActivity;

	private final CameraConfigurationManager configManager;

	public Camera camera;

	private AutoFocusManager autoFocusManager;

	private Rect framingRect;

	private Rect framingRectInPreview;

	private boolean initialized;

	private boolean previewing;

	private int requestedFramingRectWidth;

	private int requestedFramingRectHeight;

	/**
	 * Preview frames are delivered here, which we pass on to the registered
	 * handler. Make sure to clear the handler so it will only receive one
	 * message.
	 */
	private final PreviewCallback previewCallback;

	public CameraManager(Context context,Activity activity) {
		this.context = context;
		this.mActivity = activity;
		this.configManager = new CameraConfigurationManager(context);
		previewCallback = new PreviewCallback(configManager);
	}

	/**
	 * Opens the camera driver and initializes the hardware parameters.
	 *
	 * @param holder
	 *            The surface object which the camera will draw preview frames
	 *            into.
	 * @throws IOException
	 *             Indicates the camera driver failed to open.
	 */
	public synchronized void openDriver(SurfaceHolder holder)
			throws IOException {
		Camera theCamera = camera;
		if (theCamera == null) {
			// 获取手机背面的摄像头
			theCamera = chooseOpen();
			if (theCamera == null) {
				throw new IOException();
			}
			camera = theCamera;
		}

		// 设置摄像头预览view
		theCamera.setPreviewDisplay(holder);

		if (!initialized) {
			initialized = true;
			configManager.initFromCameraParameters(theCamera);

		}

		Camera.Parameters parameters = theCamera.getParameters();// 获取照相机
		CaptureActivity.setCameraDisplayOrientation(mActivity, 0,camera);
		parameters.setPictureFormat(PixelFormat.JPEG);// 设置照片输出的格式
		parameters.set("jpeg-quality", 100);// 设置照片质量
		setCameraResolution(parameters);//这个是设置预览和照片最高的像素
//		setPreviewSize(parameters);//这个是设置预览和手机差不多的像素
//		setPictureSize(parameters);//这个是设置照片和手机差不多的像素
		camera.setParameters(parameters); // 设置照相机参数


		String parametersFlattened = parameters == null ? null : parameters
				.flatten(); // Save
		// these,
		// temporarily
		try {
			configManager.setDesiredCameraParameters(theCamera, false);
		} catch (RuntimeException re) {
			// Driver failed
			Log.w(TAG,
					"Camera rejected parameters. Setting only minimal safe-mode parameters");
			Log.i(TAG, "Resetting to saved camera params: "
					+ parametersFlattened);
			// Reset:
			if (parametersFlattened != null) {
				parameters = theCamera.getParameters();
				parameters.unflatten(parametersFlattened);
				try {
					theCamera.setParameters(parameters);
					configManager.setDesiredCameraParameters(theCamera, true);
				} catch (RuntimeException re2) {
					// Well, darn. Give up
					Log.w(TAG,
							"Camera rejected even safe-mode parameters! No configuration");
				}
			}
		}

	}

	/**
	 * 用于检测手机上摄像头的个数，如果有两个摄像头，则取背面的摄像头
	 */
	@SuppressLint("NewApi") public Camera chooseOpen() {

		int numCameras = Camera.getNumberOfCameras();
		if (numCameras == 0) {
			Log.w(TAG, "No cameras!");
			return null;
		}

		int index = 0;
		while (index < numCameras) {
			Camera.CameraInfo cameraInfo = new Camera.CameraInfo();
			Camera.getCameraInfo(index, cameraInfo);
			// CAMERA_FACING_BACK：手机背面的摄像头
			if (cameraInfo.facing == Camera.CameraInfo.CAMERA_FACING_BACK) {
				break;
			}
			index++;
		}

		Camera camera;
		if (index < numCameras) {
			Log.i(TAG, "Opening camera #" + index);
			camera = Camera.open(index);
		} else {
			Log.i(TAG, "No camera facing back; returning camera #0");
			camera = Camera.open(0);
		}

		return camera;
	}

	public synchronized boolean isOpen() {
		return camera != null;
	}

	/**
	 * Closes the camera driver if still in use.
	 */
	public synchronized void closeDriver() {
		if (camera != null) {
			camera.release();
			camera = null;
			// Make sure to clear these each time we close the camera, so that
			// any scanning rect
			// requested by intent is forgotten.
			framingRect = null;
			framingRectInPreview = null;
		}
	}

	/**
	 * Asks the camera hardware to begin drawing preview frames to the screen.
	 */
	public synchronized void startPreview() {
		Camera theCamera = camera;
		if (theCamera != null && !previewing) {
			// Starts capturing and drawing preview frames to the screen
			// Preview will not actually start until a surface is supplied with
			// setPreviewDisplay(SurfaceHolder) or
			// setPreviewTexture(SurfaceTexture).
			theCamera.startPreview();
			previewing = true;
			autoFocusManager = new AutoFocusManager(context, camera);
		}
	}

	/**
	 * 重启预览
	 */
	public void restartPreview(){
		if (camera != null){
			camera.startPreview();
			autoFocusManager = new AutoFocusManager(context, camera);
		}
	}

	/**
	 * Tells the camera to stop drawing preview frames.
	 */
	public synchronized void stopPreview() {
		if (autoFocusManager != null) {
			autoFocusManager.stop();
			autoFocusManager = null;
		}
		if (camera != null && previewing) {
			camera.stopPreview();
			previewCallback.setHandler(null, 0);
			previewing = false;
		}
	}

	/**
	 * 闪光灯开关
	 * @param open
	 */
	public void setFlash(Boolean open) {
		try {
			Camera.Parameters mParameters;
			mParameters = camera.getParameters();
			if (open) {
				mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
			}else {
				mParameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);
			}
			camera.setParameters(mParameters);
		} catch (Exception ex) {
		}
	}

	/**
	 * Convenience method for
	 */
	public synchronized void setTorch(boolean newSetting) {
		if (newSetting != configManager.getTorchState(camera)) {
			if (camera != null) {
				if (autoFocusManager != null) {
					autoFocusManager.stop();
				}
				configManager.setTorch(camera, newSetting);
				if (autoFocusManager != null) {
					autoFocusManager.start();
				}
			}
		}
	}

	/**
	 * A single preview frame will be returned to the handler supplied. The data
	 * will arrive as byte[] in the message.obj field, with width and height
	 * encoded as message.arg1 and message.arg2, respectively. <br/>
	 *
	 * 两个绑定操作：<br/>
	 * 1：将handler与回调函数绑定；<br/>
	 * 2：将相机与回调函数绑定<br/>
	 * 综上，该函数的作用是当相机的预览界面准备就绪后就会调用hander向其发送传入的message
	 *
	 * @param handler
	 *            The handler to send the message to.
	 * @param message
	 *            The what field of the message to be sent.
	 */
	public synchronized void requestPreviewFrame(Handler handler, int message) {
		Camera theCamera = camera;
		if (theCamera != null && previewing) {
			previewCallback.setHandler(handler, message);

			// 绑定相机回调函数，当预览界面准备就绪后会回调Camera.PreviewCallback.onPreviewFrame
			theCamera.setOneShotPreviewCallback(previewCallback);
		}
	}

	/**
	 * Calculates the framing rect which the UI should draw to show the user
	 * where to place the barcode. This target helps with alignment as well as
	 * forces the user to hold the device far enough away to ensure the image
	 * will be in focus.
	 *
	 * @return The rectangle to draw on screen in window coordinates.
	 */
	public synchronized Rect getFramingRect() {
		Point screenResolution = configManager.getScreenResolution();
		if (framingRect == null) {
			if (camera == null) {
				return null;
			}
			int width = screenResolution.x * 4 / 5;
			// if (width < MIN_FRAME_WIDTH) {
			// width = MIN_FRAME_WIDTH;
			// } else if (width > MAX_FRAME_WIDTH) {
			// width = MAX_FRAME_WIDTH;
			// }
			int height = screenResolution.y * 88 / 99;
			// if (height < MIN_FRAME_HEIGHT) {
			// height = MIN_FRAME_HEIGHT;
			// } else if (height > MAX_FRAME_HEIGHT) {
			// height = MAX_FRAME_HEIGHT;
			// }
			int leftOffset = (screenResolution.x - width) / 2;
			// int topOffset = screenResolution.y * 24 / 102;
			int topOffset = (screenResolution.y - height) / 2;
			framingRect = new Rect(leftOffset, topOffset, leftOffset + width,
					topOffset + height);
			// Log.d(TAG, "Calculated framing rect: " + framingRect);
		}
		return framingRect;
	}

	/**
	 * Target 5/8 of each dimension<br/>
	 * 计算结果在hardMin~hardMax之间
	 *
	 * @param resolution
	 * @param hardMin
	 * @param hardMax
	 * @return
	 */
	private static int findDesiredDimensionInRange(int resolution, int hardMin,
												   int hardMax) {
		int dim = resolution; // Target 5/8 of each dimension
		if (dim < hardMin) {
			return hardMin;
		}
		if (dim > hardMax) {
			return hardMax;
		}
		return dim;
	}

	/**
	 * Like {@link #getFramingRect} but coordinates are in terms of the preview
	 * frame, not UI / screen.
	 */
	public synchronized Rect getFramingRectInPreview() {
		if (framingRectInPreview == null) {
			Rect rect = new Rect(getFramingRect());
			Point cameraResolution = configManager.getCameraResolution();
			Point screenResolution = configManager.getScreenResolution();
			rect.left = rect.left * cameraResolution.y / screenResolution.x;
			rect.right = rect.right * cameraResolution.y / screenResolution.x;
			rect.top = rect.top * cameraResolution.x / screenResolution.y;
			rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;
			framingRectInPreview = rect;
		}
		return framingRectInPreview;
	}



	/**
	 * A factory method to build the appropriate LuminanceSource object based on
	 * the format of the preview buffers, as described by Camera.Parameters.
	 *
	 * @param data
	 *            A preview frame.
	 * @param width
	 *            The width of the image.
	 * @param height
	 *            The height of the image.
	 * @return A PlanarYUVLuminanceSource instance.
	 */
	public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data,
														 int width, int height) {
		Rect rect = getFramingRectInPreview();
		if (rect == null) {
			return null;
		}
		// Go ahead and assume it's YUV rather than die.
		return new PlanarYUVLuminanceSource(data, width, height, rect.left,
				rect.top, rect.width(), rect.height(), false);
	}

	/**
	 * 设置预览和照片分辨率
	 * @param parameters
	 */
	private void setCameraResolution(Camera.Parameters parameters){
		try {
			List<Size> supportedPreviewSizes = parameters.getSupportedPreviewSizes();
			List<Size> supportedPictureSizes = parameters.getSupportedPictureSizes();
			for (int i = 0; i < supportedPreviewSizes.size(); i++) {
				if(supportedPreviewSizes.get(0).width>800){
					parameters.setPreviewSize(supportedPreviewSizes.get(0).width, supportedPreviewSizes.get(0).height);
					Log.d("log", "自定义相机像素："+supportedPreviewSizes.get(0).width+"==="+supportedPreviewSizes.get(0).height);
				}else{
					parameters.setPreviewSize(supportedPreviewSizes.get(supportedPreviewSizes.size()).width, supportedPreviewSizes.get(supportedPreviewSizes.size()).height);
				}
			}
			for (int i = 0; i < supportedPictureSizes.size(); i++) {
				if(supportedPictureSizes.get(0).width>800){
					parameters.setPictureSize(supportedPictureSizes.get(0).width, supportedPictureSizes.get(0).height);
				}else{
					parameters.setPictureSize(supportedPictureSizes.get(supportedPictureSizes.size()).width, supportedPictureSizes.get(supportedPictureSizes.size()).height);
				}
			}
		} catch (Exception e) {
			// TODO: handle exception
		}
	}

	/** 预览界面分辨率 */
	public  void setPreviewSize(Camera.Parameters parametes) {
		List<Camera.Size> localSizes = parametes.getSupportedPreviewSizes();
		Camera.Size biggestSize = null;
		Camera.Size fitSize = null;// 优先选屏幕分辨率
		Camera.Size targetSize = null;// 没有屏幕分辨率就取跟屏幕分辨率相近(大)的size
		Camera.Size targetSiz2 = null;// 没有屏幕分辨率就取跟屏幕分辨率相近(小)的size
		if(localSizes != null) {
			int cameraSizeLength = localSizes.size();
			for (int n = 0; n < cameraSizeLength; n++) {
				Camera.Size size = localSizes.get(n);
				if(biggestSize == null ||
						(size.width >= biggestSize.width && size.height >= biggestSize.height)) {
					biggestSize = size;
				}

				if(size.width == Utils.getScreenWH(context).heightPixels && size.height == Utils.getScreenWH(context).widthPixels) {
					fitSize = size;
				} else if (size.width == Utils.getScreenWH(context).heightPixels || size.height == Utils.getScreenWH(context).widthPixels) {
					if(targetSize == null) {
						targetSize = size;
					} else if (size.width < Utils.getScreenWH(context).heightPixels || size.height < Utils.getScreenWH(context).widthPixels) {
						targetSiz2 = size;
					}
				}
			}

			if(fitSize == null) {
				fitSize = targetSize;
			}

			if(fitSize == null) {
				fitSize = targetSiz2;
			}

			if(fitSize == null) {
				fitSize = biggestSize;
			}
			parametes.setPreviewSize(fitSize.width, fitSize.height);
		}

	}

	/** 输出的照片为最高像素 */
	public  void setPictureSize(Camera.Parameters parametes) {
		List<Camera.Size> localSizes = parametes.getSupportedPictureSizes();
		Camera.Size biggestSize = null;
		Camera.Size fitSize = null;// 优先选预览界面的尺寸
		Camera.Size previewSize = parametes.getPreviewSize();
		float previewSizeScale = 0;
		if(previewSize != null) {
			previewSizeScale = previewSize.width / (float) previewSize.height;
		}

		if(localSizes != null) {
			int cameraSizeLength = localSizes.size();
			for (int n = 0; n < cameraSizeLength; n++) {
				Camera.Size size = localSizes.get(n);
				if(biggestSize == null) {
					biggestSize = size;
				} else if(size.width >= biggestSize.width && size.height >= biggestSize.height) {
					biggestSize = size;
				}

				// 选出与预览界面等比的最高分辨率
				if(previewSizeScale > 0
						&& size.width >= previewSize.width && size.height >= previewSize.height) {
					float sizeScale = size.width / (float) size.height;
					if(sizeScale == previewSizeScale) {
						if(fitSize == null) {
							fitSize = size;
						} else if(size.width >= fitSize.width && size.height >= fitSize.height) {
							fitSize = size;
						}
					}
				}
			}

			// 如果没有选出fitSize, 那么最大的Size就是FitSize
			if(fitSize == null) {
				fitSize = biggestSize;
			}

			parametes.setPictureSize(fitSize.width, fitSize.height);
		}
	}
}
